← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 807 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 51 =
  2. 2.Half of 116 =
  3. 3.Half of 138 =
  4. 4.Double 53 =
  5. 5.Double 95 =
  6. 6.Half of 66 =
  7. 7.Double 39 =
  8. 8.Double 29 =
  9. 9.Half of 72 =
  10. 10.Half of 36 =
  11. 11.Half of 142 =
  12. 12.Half of 42 =
  13. 13.Double 79 =
  14. 14.Half of 184 =
  15. 15.Double 19 =
  16. 16.Double 87 =
  17. 17.Half of 96 =
  18. 18.Double 32 =
  19. 19.Half of 82 =
  20. 20.Half of 44 =
  21. 21.Double 67 =
  22. 22.Double 86 =
  23. 23.Half of 56 =
  24. 24.Double 22 =
  25. 25.Half of 192 =
  26. 26.Double 31 =
  27. 27.Double 63 =
  28. 28.Half of 160 =
  29. 29.Half of 154 =
  30. 30.Half of 174 =
  31. 31.Half of 114 =
  32. 32.Double 74 =
  33. 33.Double 83 =
  34. 34.Double 28 =
  35. 35.Half of 176 =
  36. 36.Double 37 =
  37. 37.Double 73 =
  38. 38.Double 16 =
  39. 39.Double 34 =
  40. 40.Double 91 =

Answer key

  1. 102
  2. 58
  3. 69
  4. 106
  5. 190
  6. 33
  7. 78
  8. 58
  9. 36
  10. 18
  11. 71
  12. 21
  13. 158
  14. 92
  15. 38
  16. 174
  17. 48
  18. 64
  19. 41
  20. 22
  21. 134
  22. 172
  23. 28
  24. 44
  25. 96
  26. 62
  27. 126
  28. 80
  29. 77
  30. 87
  31. 57
  32. 148
  33. 166
  34. 56
  35. 88
  36. 74
  37. 146
  38. 32
  39. 68
  40. 182

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths